I have to admit, I’m not really up on the Underworld series. I know the basic gist, vampires versus werewolves, but five movies in, I’m couldn’t tell you if that’s still the focus. It certainly seems like it is in the new trailer for the fifth film, Underworld: Blood Wars.
Source: io9 – The Trailer for Underworld: Blood Wars Is Sure to Make Underworld Fans Happy